^^^^^^^^^^^^^^^ Ha ha
Well if you cant master a 12mm bing that's sad.
I don't think its the bing that's f---up, hint!
I think your tuning skill is just lacking.
P.S.
It might not be that the bing is the problem with your moped.
Timing , spark ,condenser, low compression, plugged exhaust, plugged fuel system, spark plug or its gap. (edited)